Tuning redox and chemical characteristics of Mo-based catalysts for bioenergy applications – The case of catalysts supported on TiO2 or ZrO2

Díaz-García, L.; Valencia, Diego; Navarrete‐Bolaños, Juan; Terrés, E.; Ramírez-Verduzco, Luis Felipe; Aburto, Jorge

doi:10.1016/j.mtcomm.2019.100543

Cited by 2 publications

(1 citation statement)

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“…Peng et al 25 correlated the structural transition and the evolution of the Mo n+ valence state with the electrocatalytic performance of α-MoO 3 and MoO 2 oxides when the materials were subjected to oxidative and/or reductive environments. The structure−catalytic activity relationship of molybdenum-based materials has also been studied by Di ́az-Garci ́a et al 26 in palmitic acid hydrodeoxygenation tests. These authors showed that the enhancement of the catalytic activity is directly associated with the presence of mixed-valence Mo (Mo 6+ , Mo 5+ , and Mo 4+ ) states in the catalysts.…”

Section: Introductionmentioning

confidence: 99%

α-MoO₃ Micro- and Nanoparticles as Catalysts for Biofuel Production

Silva Lucena de Medeiros,

Menezes de Oliveira,

Duarte

et al. 2024

ACS Appl. Nano Mater.

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Herein, α-MoO3 micro- and nanoparticles were synthesized by a modified Pechini method, and the impact of the crystal structure and crystal growth orientation on the formation of ionic defects and, consequently, on the catalytic performance of the materials in the ethylic transesterification reaction for biodiesel production was investigated. Structural refinements from X-ray diffraction data and Raman spectra revealed the formation of α-MoO3 in a Pbnm orthorhombic phase, with nanoplate-like morphology at 500 °C (thickness between 100 and 260 nm) or ribbon-like morphology at 700 °C (thickness between 400 and 900 nm). An anisotropic crystal orientation along the [010] direction was observed with an increase of the calcination temperature. We emphasize the dependence of the orientation change with the elimination of ionic-type defects (oxygen vacancies and reduced Mo5+ centers) by the temperature using complementary techniques such as X-ray photoelectron and electron paramagnetic resonance spectroscopies. The catalytic activity of the samples depends on the orientation process and the presence of defects that act as acid-active sites on the catalyst surface and therefore play an important role in biodiesel production. This effect was confirmed by surface stability and reactivity simulated by density functional theory calculations, suggesting that the Mo and O surface terminals greatly impacted the interface catalytic reaction. The highest catalytic performance toward the biodiesel conversion (89% of conversion at 150 °C for 2 h) was achieved for the polycrystalline catalyst calcined at 500 °C, which was correlated with random crystal orientation and the presence of reduced Mo5+ and oxygen vacancy centers on the different facets exposed on the surface. The biodiesel production was confirmed by 1H and 13C NMR spectroscopy and gas chromatography analysis.

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Section: Introductionmentioning

confidence: 99%

α-MoO₃ Micro- and Nanoparticles as Catalysts for Biofuel Production

Silva Lucena de Medeiros,

Menezes de Oliveira,

Duarte

et al. 2024

ACS Appl. Nano Mater.

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Robust polymer incorporated TiO₂‐ZrO₂ microsphere coatings by electrospraying technique with excellent and durable self cleaning, antibacterial and photocatalytic functionalities

Simon

George

Chandran³

et al. 2021

J of Applied Polymer Sci

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The applications of self‐cleaning coatings on large scale are limited due to their poor durability, remnants of hazardous by‐products and lack of biocompatibility. We propose to solve this problem by developing TiO2‐ZrO2 composite‐based self cleaning coatings. In order to achieve this task another important aspect was to select biocompatible polymers poly (methyl methacrylate) and pluronic F‐127 (PF‐127) as they can enhance the self‐cleaning capability of TiO2‐ZrO2 which itself is biocompatible and endowed with anti‐bacterial capability. The selection of a preparation technique that could produce coatings mimicking the nature has also been important and hence Electrospraying technique was selected as the processing method. The samples were then characterized using various techniques like field emission scanning electron microscopy, X‐ray diffraction, high resolution transmission electron microscopy, Brunauer–Emmett–Teller analysis, and so forth to fathom the interlink between observed properties and morphology. High quality superhydrophobic and superhydrophilic films have been generated and the surfaces were modulated by the addition of tri‐block co‐polymer which was found to provide swapping of superhydrophobic nature to superhydrophilic nature. The integration of superhydrophobic, superhydrophilic, photocatalytic and antibacterial properties in the prepared microsphere coatings is a unique achievement and may interest those in the quest for self‐cleaning materials for antibacterial coatings in mitigating surgical site infections, medical implants, coronary stent surfaces, and so forth.

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Tuning redox and chemical characteristics of Mo-based catalysts for bioenergy applications – The case of catalysts supported on TiO2 or ZrO2

Cited by 2 publications

References 38 publications

α-MoO₃ Micro- and Nanoparticles as Catalysts for Biofuel Production

α-MoO₃ Micro- and Nanoparticles as Catalysts for Biofuel Production

Robust polymer incorporated TiO₂‐ZrO₂ microsphere coatings by electrospraying technique with excellent and durable self cleaning, antibacterial and photocatalytic functionalities

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Tuning redox and chemical characteristics of Mo-based catalysts for bioenergy applications – The case of catalysts supported on TiO2 or ZrO2

Cited by 2 publications

References 38 publications

α-MoO3 Micro- and Nanoparticles as Catalysts for Biofuel Production

α-MoO3 Micro- and Nanoparticles as Catalysts for Biofuel Production

Robust polymer incorporated TiO2‐ZrO2 microsphere coatings by electrospraying technique with excellent and durable self cleaning, antibacterial and photocatalytic functionalities

Contact Info

Product

Resources

About

α-MoO₃ Micro- and Nanoparticles as Catalysts for Biofuel Production

α-MoO₃ Micro- and Nanoparticles as Catalysts for Biofuel Production

Robust polymer incorporated TiO₂‐ZrO₂ microsphere coatings by electrospraying technique with excellent and durable self cleaning, antibacterial and photocatalytic functionalities